The World's 18 Strangest Pools

These aren't your backyard swimming holes. The strangest pools in the world will take you for a swim by the terraced gardens of Bali, in blood-red water in Turkey or in a 3000-foot monstrosity built on the Chilean coast.

Intercontinental Hotel

Intercontinental Hotel

Where: Hong Kong

The Intercontinental Hotel in Hong Kong has lavish amenities and the skyline to back it up. And the cherry on top is a set of three pools that sit atop its third-floor spa deck, overlooking Victoria Harbor. With the three pools set to different temperatures—cold, warm and hot—visitors can choose the water that's just right as they enjoy the closeup view of the Hong Kong skyline.

Blue Lagoon Geothermal Spa

Blue Lagoon Geothermal Spa

Where: Grindavik, Iceland

Blue Lagoon is one of the most famous spots on an island known for its gorgeous and mystical geothermal features. The pool is fed by superheated water vented from the ground near a lava flow, and the lagoon is renewed every two days by a nearby geothermal plant through a combination of natural and artificial filtering. Water is heated naturally beneath the earth's surface and takes in minerals on its way to the lagoon. The water, which stays at about 100 degrees Fahrenheit, is rich in minerals like silica and sulphur, and some people claim it has healing powers for skin diseases like psoriasis.